A230064 Number of nX4 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

0, 81, 441, 15129, 281961, 6487209, 137945025, 3020271849, 65409597009, 1422349620129, 30882371810481, 670905678011409, 14572037106084249, 316528933014939681, 6875333045808325641, 149340930039835655625

Offset: 1

Author

R. H. Hardin, Oct 08 2013

Keywords

• nonn

Comments

Column 4 of A230068

Examples

			Some solutions for n=4
..1..1..0..1....1..1..0..0....2..2..2..0....1..1..1..1....1..2..1..1
..1..1..1..2....1..1..2..2....0..0..2..1....1..1..1..1....0..1..1..0
..1..1..1..1....2..2..2..1....1..0..1..1....0..2..2..0....2..0..2..1
..1..1..1..1....0..0..1..0....2..1..1..1....0..2..2..0....2..0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 17*a(n-1) +132*a(n-2) -633*a(n-3) -223*a(n-4) +1688*a(n-5) +49*a(n-6) -593*a(n-7) +68*a(n-8) +9*a(n-9) -a(n-10) for n>11